src/interfaces/localed/localed.c

   1 /*
   2  * Copyright (c) 2014 Ian Sutton <ian@kremlin.cc>
   3  *
   4  * Permission to use, copy, modify, and distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #include <unistd.h>
  18 #include <limits.h>
  19 #include <signal.h>
  20
  21 #include <sys/param.h>
  22 #include <string.h>
  23
  24 #include <glib/gprintf.h>
  25 #include <glib-unix.h>
  26 #include <polkit/polkit.h>
  27
  28 #include "localed-gen.h"
  29 #include "localed.h"
  30
  31 GPtrArray *localed_freeable;
  32 Locale1 *localed_interf;
  33
  34 GMainLoop *localed_loop;
  35
  36 guint bus_descriptor;
  37 gboolean dbus_interface_exported; /* reliable because of gdbus operational guarantees */
  38
  39 /* --- begin method/property/dbus signal code --- */
  40
  41 /*static gboolean
  42 on_handle_set_hostname(Locale1 *hn1_passed_interf,
  43                        GDBusMethodInvocation *invoc,
  44                        const gchar *greet,
  45                        gpointer data) {
  46     return FALSE;
  47 }
  48
  49 const gchar *
  50 our_get_hostname() {
  51
  52     gchar *hostname_buf, *ret;
  53     size_t hostname_divider;
  54
  55     hostname_buf = (gchar*) g_malloc0(MAXHOSTNAMELEN);
  56     ret          = (gchar*) g_malloc0(MAXHOSTNAMELEN);
  57     g_ptr_array_add(localed_freeable, hostname_buf);
  58     g_ptr_array_add(localed_freeable, ret);
  59
  60     if(gethostname(hostname_buf, MAXHOSTNAMELEN))
  61         return "";
  62
  63     hostname_divider = strcspn(hostname_buf, ".");
  64
  65     return strncpy(ret, hostname_buf, hostname_divider);
  66 }*/
  67
  68 /* --- end method/property/dbus signal code, begin bus/name handlers --- */
  69
  70 static void localed_on_bus_acquired(GDBusConnection *conn,
  71                                     const gchar *name,
  72                                     gpointer user_data) {
  73
  74     g_printf("got bus/name, exporting %s's interface...\n", name);
  75
  76     localed_interf = locale1_skeleton_new();
  77
  78     /* attach function pointers to generated struct's method handlers
  79     g_signal_connect(localed_interf, "handle-set-hostname", G_CALLBACK(on_handle_set_hostname), NULL); */
  80
  81     /* set our properties before export
  82     locale1_set_hostname(localed_interf, our_get_hostname()); */
  83
  84     if(!g_dbus_interface_skeleton_export(G_DBUS_INTERFACE_SKELETON(localed_interf),
  85                                          conn,
  86                                          "/org/freedesktop/locale1",
  87                                          NULL)) {
  88
  89         g_printf("failed to export %s's interface!\n", name);
  90         localed_mem_clean();
  91
  92     } else {
  93
  94         dbus_interface_exported = TRUE;
  95         g_printf("exported %s's interface on the system bus...\n", name);
  96     }
  97 }
  98
  99 static void localed_on_name_acquired(GDBusConnection *conn,
 100                                      const gchar *name,
 101                                      gpointer user_data) {
 102
 103     g_printf("success!\n");
 104 }
 105
 106 static void localed_on_name_lost(GDBusConnection *conn,
 107                                    const gchar *name,
 108                                    gpointer user_data) {
 109
 110     if(!conn) {
 111
 112         g_printf("failed to connect to the system bus while trying to acquire name '%s': either dbus-daemon isn't running or we don't have permission to push names and/or their interfaces to it.\n", name);
 113         localed_mem_clean();
 114     }
 115
 116     g_print("lost name %s, exiting...\n", name);
 117
 118     localed_mem_clean();
 119 }
 120
 121 /* --- end bus/name handlers, begin misc unix functions --- */
 122
 123 /* safe call to clean and then exit
 124  * this stops our GMainLoop safely before letting main() return */
 125 void localed_mem_clean() {
 126
 127     g_printf("exiting...\n");
 128
 129     if(dbus_interface_exported)
 130         g_dbus_interface_skeleton_unexport(G_DBUS_INTERFACE_SKELETON(localed_interf));
 131
 132     if(g_main_loop_is_running(localed_loop))
 133         g_main_loop_quit(localed_loop);
 134
 135 }
 136
 137 /* wrapper for glib's unix signal handling; called only once if terminating signal is raised against us */
 138 gboolean unix_sig_terminate_handler(gpointer data) {
 139
 140     g_printf("caught SIGINT/HUP/TERM, exiting\n");
 141
 142     localed_mem_clean();
 143     return G_SOURCE_REMOVE;
 144 }
 145
 146 void set_signal_handlers() {
 147
 148     /* we don't care about its descriptor, we never need to unregister these */
 149     g_unix_signal_add(SIGINT,  unix_sig_terminate_handler, NULL);
 150     g_unix_signal_add(SIGHUP,  unix_sig_terminate_handler, NULL);
 151     g_unix_signal_add(SIGTERM, unix_sig_terminate_handler, NULL);
 152 }
 153
 154 int main() {
 155
 156     set_signal_handlers();
 157
 158     localed_loop = g_main_loop_new(NULL, TRUE);
 159     localed_freeable = g_ptr_array_new();
 160
 161      bus_descriptor = g_bus_own_name(G_BUS_TYPE_SYSTEM,
 162                                     "org.freedesktop.locale1",
 163                                     G_BUS_NAME_OWNER_FLAGS_NONE,
 164                                     localed_on_bus_acquired,
 165                                     localed_on_name_acquired,
 166                                     localed_on_name_lost,
 167                                     NULL,
 168                                     NULL);
 169
 170     g_main_loop_run(localed_loop);
 171     /* runs until single g_main_loop_quit() call is raised inside <interface>_mem_clean() */
 172     g_main_loop_unref(localed_loop);
 173
 174     /* guaranteed unownable */
 175     g_bus_unown_name(bus_descriptor);
 176
 177     /* at this point no operations can occur with our data, it is safe to free it + its container */
 178     g_ptr_array_free(localed_freeable, TRUE);
 179
 180     return 0;
 181 }